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Method for preparing polyether modified HMDI waterborne polyurethane curing agent

A water-based polyurethane, polyether modification technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of difficult to promote water-based paint, high cost, high price, etc., achieve high fullness, good yellowing resistance , The effect of strong pollution resistance

Active Publication Date: 2016-06-15
UNION FOSHAN CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the polyurethane curing agents commonly used in the market are solvent-based. Water-based polyurethane curing agents are basically produced by foreign companies such as Bayer and Rhodia. Low-cost water-based polyurethane curing agent has become the first choice for the domestic coatings industry

Method used

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  • Method for preparing polyether modified HMDI waterborne polyurethane curing agent
  • Method for preparing polyether modified HMDI waterborne polyurethane curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Add metered 11 parts of polyethylene glycol monobutyl ether (Mr1000) in the dripping kettle, after vacuum heating and dehydration for 2h, feed N 2 Seal it for later use; in the synthesis kettle, add 20 parts of propylene glycol methyl ether acetate, and after vacuum heating and dehydration for 2h, feed into N 2 , adding 69 parts of H 12 After MDI is heated and dissolved, add polyethylene glycol monobutyl ether dropwise, keep a constant temperature reaction at 75-80°C for 3-4hrs, and add 2,4,6-tris(dimethylaminomethyl) when the NCO content is close to the calculated value base) 0.2 part of phenol, cooled and filtered to obtain a polyether modified H 12 MDI water-based polyurethane curing agent.

Embodiment 2

[0012] Add metered 8 parts of polyethylene glycol monobutyl ether (Mr1000) in the dripping kettle, after vacuum heating and dehydration for 2h, pass into N 2 It is sealed for later use; in the synthesis kettle, add 20 parts of propylene glycol methyl ether acetate and carry out vacuum heating and dehydration for 2h, feed into N 2 , adding 72 parts of H 6 After the MDI is heated and dissolved, add polyethylene glycol monobutyl ether dropwise, keep a constant temperature reaction at 70-80°C for 3-4hrs, and add 2,4,6-tris(dimethylaminomethyl) when the NCO content is close to the calculated value Base) 0.2 part of phenol, cooled and filtered to obtain a polyether modified H with 80% solid content and 17.6% NCO 6 MDI water-based polyurethane curing agent.

Embodiment 3

[0014] Add metered 10 parts of polyethylene glycol (Mr1000) in the dripping kettle, after vacuum heating and dehydration for 2h, feed N 2 Seal it for later use; in the synthesis kettle, add 20 parts of diethylene glycol ethyl ether acetate and carry out vacuum heating and dehydration for 2 hours, then pass into N 2 , adding 70 parts of H 12 After MDI is heated and dissolved, add polyethylene glycol monobutyl ether dropwise, keep a constant temperature reaction at 75-80°C for 3-4hrs, and add 2,4,6-tris(dimethylaminomethyl) when the NCO content is close to the calculated value base) 0.2 part of phenol, cooled and filtered to obtain a polyether modified H with 80% solid content and 16.4% NCO 12 MDI water-based polyurethane curing agent.

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Abstract

The invention relates to a method for preparing a polyether modified HMDI waterborne polyurethane curing agent. The curing agent is mainly prepared from hydrogenated diphenyl-methane-diisocyanate H6MDI or H12MDI, polyether polyol, inert solvent and polymerization inhibitor. The polyether modified HMDI waterborne polyurethane curing agent does not contain aromatic hydrocarbon, glycol ether or alkylphenol, has the characteristics of environmental friendliness, good scratch resistance, good transparence, excellent chemical resistance, strong pollution resistance, good yellowing resistance and the like; and polyurethane paint prepared from a waterborne hydroxyl component has the characteristics of high hardness, high transparence, good film scratch resistance, good leveling property, high fullness, good solubility and the like, can be widely applied to waterborne wood lacquer, waterborne industrial paint, waterborne plastic paint and other various dual-component waterborne polyester paint, waterborne polyurethane paint, waterborne epoxy paint, waterborne alkyd paint, waterborne polyurethane glue and other specific curing agents.

Description

technical field [0001] The invention relates to a preparation method of a waterborne polyurethane curing agent, in particular to a polyether modified HMDI waterborne polyurethane curing agent. Background technique [0002] Over the past 30 years of China's reform and opening up, the problem of environmental degradation has gradually emerged. According to the research of environmental departments and experts, the main pollution sources such as automobile exhaust, VOC, and flying dust are the main causes of haze weather. Among the main pollution sources, VOC emissions from the paint and coating industry account for 1% of the total VOC emissions. / 4 or more; China's annual VOC emissions exceed 20 million tons, which is twice that of the United States and three times that of the European Union. Recently, the smog has been reduced across the country. The whole society attaches great importance to the development of green production and green products. The government has also iss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/78C08G18/75C08G18/48C09D7/12C09D175/04
CPCC08G18/75C08G18/78C09D175/04C08G18/48C09D7/40
Inventor 许钧强康伦国姚东生阳京辉
Owner UNION FOSHAN CHEM
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